y1,
is your definition of an incedence matrix the following?
each row represents a vertex and each column represents
an edge. Where i = vertex and j = edge? Did you code the
problem according to the definition above? It appears your
code is for an adjacency matrix where both i and j = vertex.

For example: both of the following represents the same
graph, but one is an adjacency matrix and the other
is an incedence matrix.

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